Over at myWorld Hardware there is a new review posted of the Gigabyte board using the SIS 655FX chipset. Take a look as the performance is compared to an Abit IC7 and an Epox Epox 4PCA+.

"The GA-8S655FX Ultra is an excellent performing board and it does
pose a
threat to Intel's mainstream i865 platform with its value pricetag.
From the
benchmark results, SIS's 655FX Chipset does hold some solid ground
on the
Pentium 4 platform. It's about time that an alternative showed up
to give
Intel some deserving competition."